Sat, Nov 06, 2021
AD 2021-21-11 Requires Inspecting The Engine Mount, The Temperature Probe, And The Reversing Cable For Damage
The FAA is adopting a new airworthiness directive (AD) for certain Pacific Aerospace Limited Model 750XL airplanes.
This AD was prompted by mandatory continuing airworthiness information (MCAI) originated by an aviation authority of another country to identify and correct an unsafe condition on an aviation product. The MCAI identifies the unsafe condition as insufficient clearance between the engine mount, the Beta control rod, and the inter-turbine temperature (ITT) sensing probe that could lead to chafing damage. This AD requires inspecting the engine mount, the temperature probe, and the reversing cable for damage, and taking any necessary corrective actions. The FAA is issuing this AD to address the unsafe condition on these products. This AD is effective December 10, 2021.
Supplementary Information: The FAA issued a notice of proposed rulemaking (NPRM) to amend 14 CFR part 39 by adding an AD that would apply to certain serial-numbered Pacific Aerospace Limited Model 750XL airplanes. The NPRM published in the Federal Register on July 28, 2021 (86 FR 40381). The NPRM was prompted by MCAI originated by the Civil Aviation Authority (CAA), which is the aviation authority for New Zealand. The CAA of New Zealand has issued AD DCA/750XL/35, effective date February 7, 2019 (referred to after this as “the MCAI”), to correct an unsafe condition for certain Pacific Aerospace Limited Model 750XL airplanes.
The MCAI states:
DCA/750XL/35 is prompted by a review of the engine installation procedures, which identified that the clearance between the engine mount, the Beta control rod and the inter-turbine temperature (ITT) sensing probe could be insufficient and result in chafing damage. The [CAA] AD is issued to introduce the instructions in Pacific Aerospace Mandatory Service Bulletin (MSB) PACSB/XL/102 issue 2, dated 5 November 2018.
You may examine the MCAI in the AD docket at https://www.regulations.gov by searching for and locating Docket No. FAA-2021-0604.
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